log neighbors when stabilizing

chord/topology.go

@@ -175,6 +175,11 @@ func (p Peer) Values() (ID, netip.AddrPort) {
 	return p.id, p.addr
 }
 
+// String formats the peer's address for debugging.
+func (p Peer) String() string {
+	return p.addr.String()
+}
+
 // Create creates a new Chord network using the given address as the initial node.
 func Create(addr netip.AddrPort) (*Node, error) {
 	if !addr.IsValid() {

main.go

@@ -183,6 +183,8 @@ func cliJoin(ctx context.Context, cmd *cli.Command) error {
 				slog.ErrorContext(ctx, "stabilize", slog.Any("err", err))
 				node.SuccessorFailed()
 			}
+			pred, succ := node.Neighbors(nil)
+			slog.InfoContext(ctx, "neighbors", slog.Any("predecessor", pred), slog.Any("successors", succ))
 		}
 	}()
 	<-ctx.Done()